Power-transmission mechanism



June 1l, 1929. R- o, MILLER 1,716,971

POWER TRANSMISSION MECHANISM Filed DBC. 1, 1926 mfg: 7//////// Mfg/@.12

O f 38 l l 29 I NVENTOR BY #3. ATroR Y Robert 0. Mil/e1',

Patented June ll, 1929.

UNITED STATES ROBERT OLCOTT MILLER, OF NEW BRITAIN, CONNECTICUT.

POWER-TRANSMISSION MECHAN ISM.

Application led December 1, 1926.

This invention relates to power transmission mechanisms, and moreparticularly to a machine having two shafts operated in the samedirection by a single drive, and in which one of said shafts is drivenat double the speed of the other.

One object of this invention is to provide a machine of the above naturehaving no reduction gears, friction drives, complicated beltingarrangements, sprocket wheels, or chains.

A further object of this invention is to provide a power transmissionmechanism of the above nature especially adapted for siuuiltaneouslyoperating cutters for use on metals of different degrees of hardness.

A further object is to provide a machine of the above nature which willbe simple in construction, inexpensive to manufacture, easy to installand manipulate, compact, and very eflicient and durable in use.

l/Vith these and other objects in view there has been illustrated on theaccompanying drawing one form in which the invention may be convenientlyembodied in practice.

Fig. 1 represents a front view of the machine, shown partly in section.

Fig. 2 is a longitudinal sectional view of the housing member, takenalong the line 2 2 of Fig. 1, looking in the direction of the arrows.

Fig. 3 is a transverse sectional View of the housing member, taken alongthe line 8-3 of Fig. 1, looking in the direction of the arrows. f

Fig. 4 is a transverse sectional View similar to Fig. 3, but with thehousing shown rotated through an angle of degrees.

In the manufacture of finished keys from key blanks,` some of which aregenerally made from hard metal such as steel, and others from soft metalsuch as German silver, it is often necessary to employ a pair of cuttingwheels, one of which runs at a speed about twice that of the other.Ordinarily, to operate such cutting wheels, it was necessary to mountthem on shafts driven by separate motors or other sources of power, orelse to employ complicated gearing, belting, or friction drivearrangements.

By means of the present invention, the above and other disadvantageshave been avoided, and a. machine has been devised which will operate apair of cutters from a single driving belt without the use of gearshaftat Serial No. 151,976.

to a machine for operating key cutters, it is not to be limited to suchan application, but broadly covers any power transmission mechanismwhere it is desired to utilize a single drive to simultaneously rotateone double the speed of another and in the same direction.

Referring now to the drawings in which like reference numerals denotecorresponding parts throughout the several views, the numeral 10indicates a base adapted to support two bearing posts 11 and 12, saidposts being secured to said base as by bolts 13. Mounted in the support11 is a rotatable shaft 14, said shaft having at one end an adjustingcollar 15, against which a relatively large circular cutter wheel orblade 16 is adapted to be held by a nut 17 threaded upon the end of theshaft 14. The eutter blade 16 is adapted to be clamped between a pair offlanges 17. The blade 1G is adapted to rotate rapidly for use in cuttingkeys of German silver or other soft metal. The other end 16 of the shaft14 extends within a rotary drum or housing 18, said housing preferablybeing cylindrical. The housing' 18 is normally closed lby a cover plate19 secured to said housing by screws 20. The other end of the housing 18is integrally connected to a tubular shaft 21 journaled in the post 12,previously mentioned.

The end of the tubular shaft 21 is threaded at 22 to receive arelatively small cutter blade 23. The blade 23 is clamped between a pairof flanges 23a and 23h, and said blade is adapted to rotate slowly, orat one-half the speed of the blade 16, for cutting keys of steel orother hard metal. The tubular shaft 21 is adapted to rotate upon astationary shaft 24, said shaft being prevented from rotation in anysuitable manner, as by providing it with a squared end 25, which isadapted to be located Wit-hin a corresponding square hole in a holdingpost 252 The inner end 2G of the stationary shaft 24 eX- tends withinthe drum or housing 18 and has a stationary crank arm 28 rigidly securedthereto, as by a pin 27. A similar crank arm 29 is secured upon the endof the rotatable shaft 14, as by a similar pin 30.

In order to permit the housing 18 to be Cil anv enlarged flange 33Yprovided on the tubular' shaft 21, said enlarged flange engaging thepost 12.

The pulley section 31 is provided with a `pair of oppositely alinedapertures extending through the housing and beingY adapted to supportthe ends of a transverse spindle 34 preferably by means of a frictionlit, said spindle havingl a sleeve 35 slidably and rotatably mountedthereon. -he sleeve 35 is provided at its centerrwith an enlargedportion 3G fromlwhich a pair of side rods 37 and 38 extend in oppositedirections. The rods 37 and 38 are provided on their ends with a pair ofaperture balls 39 and 40, within which said rods are adapted to slide.The balls and 40 are retained in spherical sockets 41 and 42 located inthe ends of the cranks 29 and 28 respectively.

As clearly shown in Fig. 2, the base of said sockets 4l and'42 arepreferably although vnot necessarily provided with apertures 43 be.understood that the rigl-i-t-hand crank 28 and-the balli40 will be heldin` one position.

Consequently, when the spindle 34 of the housing rotates through anangle of 45 degrees from the dotted to the full line positions shown inFig.. 4land as indicated by the arrow atthe top of said ligure, themovable1 crank 29 will turn through an angle of 90 degrees, from'thevdotted to the full line positions shown Vat the bottom of said ligureand indicated by the lower arrow. Hence, the .shaft 14 carrying` thelarge cutter blade lwill be causedto rotate twice as fast as the tubularshaft21 carrying the smal-l cutter blade 23, and it will be understoodthat both blades will turn inthe-same direction. During. this operation,the sleeve 35 will slideup and down upon the vspindle 34, and

at the same time will rock back and forth. Meanwhile, the rods 37 and 38will slide in the balls 39 and 40, the latter'being caused to rock intheir sockets 41 and 42.

l/Vhile their has been disclosed in this specification one form in whichthe invention may be embodied, it is to be understood that this form isshown for the purpose of illustration only, and that the invention isnotv to be limited to the specific disclosure but may be modified andembodied in various other forms without departing from its spirit. lnshort, the invention includes all the modiiications and embodimentscoming within the Scope of the following claims.

Having thus fully described the invention, what is claimed as new, andfor which it is desired to'secure Letters Patent, is:

1. In a power transmission mechanism, a base, a housing having exteriorpower-receiving means on its periphery, a driven shalt supported on saidbase and extending into one end of said housing, a tubular shaftintegral with the other end of said housing and supported by said base,a stationary shaft located within said tubular shaft and supported onits outer endv by said base, a transverse spindle carried by saidhousing intermediate its ends, al sleeve slidably and rotatably mountedon said spindle, said sleeve havinga pair of'rods extending fromopposite sidesthereof, one of said-rods being connected to saidstationary shaft, a. crank connected to the other rodfordriving saiddriven shaft, and power delivering means on said driven shaft and said'tubular shaft respectively.

2. In a power transmission mechanism, a

base, a housing havin-g exterior power-reV oeiving means on itsperiphery, a driven shaft supported on said base andextending into oneend of' said housing, atubular shaft integral with the other end of saidhousingand supported by said base, a stationary shaft loca-ted withinsaid tubular shaft andsupported on its outer end by said base, atransverse spindle carried by said housing intermediate its ends, asleeve slidably and rotatably mounted onf said spindle, said sleevehaving a pair ofrods 'extendingfromk opposite sides thereof, one of saidrods being connected to saidV stationary shaft, a-erank connected to theother rod for driving said 'driven shaft, and work-cutting wheels onsaid driven shaft and tubularshaftV respectively.

In testimony whereof, I'have affixed my siguatureto this specilication;

ROBERT oLooTT MILLER'.

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